Provide an implementation for put_image in dfps mode.
Provide an implementation for put_image in dfps mode.

This prevents the fallback from calling prepare_access
against the whole screen, which in turn keeps us from
transmitting the whole screen more than necessary.

fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl